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21st September 2011, 12:21 AM
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#1 |
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diyAudio Member
Join Date: Sep 2006
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Alpine MRD-M300
I got this amp in for repair it appears to power up but i get no voltage on the gate leg of the power supply fets..
Heres what i have on the 494 Pin 1:0.22 Pin 2:4.33 Pin 3:0.08 Pin 4:5.03 Pin 5:1.71 Pin 6:3.49 Pin 7:0 Pin 8:13.86 Pin 9:0 Pin 10:0 Pin 11:13.86 Pin 12:13.86 Pin 13:5.05 Pin 14:5.05 Pin 15:5.05 Pin 16:0 |
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21st September 2011, 12:49 AM
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#2 |
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diyAudio Member
Join Date: Nov 2003
Location: Louisiana
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Pin 4 is being driven high but I don't have the service manual so I can't offer any suggestions. Many times a shorted or leaking output will cause it to go into protect so check those carefully.
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